Alternating-current telegraph system.



O; MEYER.

ALTERNATI NG CURRENT TELEGRAPH SYSTEM. APPLICATION FILED 001'. 18, 1907.

953,701 Patented Apr. 5, 1910.

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G. MEYER; ALTERNAIING CURRENT TELEGRAPH SYSTEM.

APPLICATION FILED OUT 18, 1907.

Patented Apr. 5, 1910.

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CARL MEYER, OF CHARLOTT'ENBURG, GERMANY.

ALTERNATING-C'UBRENT TELEGRAPH SYSTEM.

To all whom it may concern:

Be it known that I, CARL MEYER, a subject of the German Emperor, and resident of No. 20 Grolinanstrassc, Charlottenburg, Germany, have invented certain new and useful Improvements in Alternating-Current Telegraph Systems, of which the i'ollowing is a specification.

The present invention relates to apparatus for controlling the position of an indicating device from a distance by means of alternating currents By varying the phase between the current and the electromotive force in the conductors used in transmitting signals, I am able to reduce the number of wires between the transmitting and receiving stations to a minimum. Thus in a telegraph plant with one sending apparatus and one indicator, as re resented in the accompanying drawing, on y two connecting wires are required, of Wh1ch,,in a given case, when using the earth as return conductor, one can still be dispensed with.

The invention is represented in the accompanying drawing in two figures.

Figure 1 represents a diagram with one sending apparatus and one indicator. Fig. 2 shows the detail structure of the invention indicated in a diagramin Fig. 1. o

In the sending apparatus the difierent displacements of phase of the current with regard to the electromotive force which-corresponds with the difierent signals to be transmitted are effected in known manner. In the telegraph plant represented in the drawing, the sending apparatus A contains an inductive resistance a and a non-inductive resistance 6 which are connected with one another by the movable contact member Specification of Letters Patent.

Application filed October 18, 1907.

Patented Apr. 5, 1%10.

Serial No. 397,974.

0, so that when cutting out inductive resistance a, so much ohmic resistance Z) is insorted into the circuit d, e, that the strength of current remains approximately constant, the current being merely displaced in phase with respect to the electromotive force. At the receiving place B an apparatus, say a phase measurer with a needle f is put in the circuit Z 6. With each signal to be transmitted from A to B, a certain" difi'erence of phase corresponds which is'produc'ed in the sending station A by setting the contact 0 on difierent groups of resistance, whereupon calated in one of the said circuits, the one end-of oneof said resistances being connected with one of the poles and the other or opposite end out the other of said resistances being connected with the other pole of said one circuit in which they are both intercalated, both resistances having opposite contacts and aslidable contact member connecting both resistances regulatably.

CARL MEYER.

Witnesses JOHANNES MEYER, Max PAs'ron. 

